CN102650494A - Device and technology for drying lignite by jointly using superheated steam and high frequency - Google Patents
Device and technology for drying lignite by jointly using superheated steam and high frequency Download PDFInfo
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- CN102650494A CN102650494A CN2012101584542A CN201210158454A CN102650494A CN 102650494 A CN102650494 A CN 102650494A CN 2012101584542 A CN2012101584542 A CN 2012101584542A CN 201210158454 A CN201210158454 A CN 201210158454A CN 102650494 A CN102650494 A CN 102650494A
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Abstract
The invention discloses a device and a technology for drying lignite by jointly using superheated steam and high frequency. The device comprises at least an internal heating fluidized bed dryer with a built-in heat exchanger, a high frequency drier and an external heat exchanger, wherein the internal heating fluidized bed dryer is provided with a material feeding device and a dedusting device; the built-in heat exchanger of the internal heating fluidized bed dryer is connected with saturated steam; a fluidized bed of the internal heating fluidized bed dryer is connected with superheated steam; the built-in heat exchanger is further connected with a condensate water system; after exhaust gas of the internal heating fluidized bed dryer is primarily dedusted by the dedusting device, pressurized by a pressurizing device and secondarily dedusted by the dedusting device, one part of the exhaust gas returns to the fluidized bed and the other part of the exhaust gas is evacuated after exchanging heat with pressurized air via the external heat exchanger; and the heated air enters the high frequency drier via a ventilation system. The device has the advantages of low energy consumption, good drying effect, environmental friendliness, water conservation, and the like.
Description
Technical field
The present invention relates to a kind of brown coal drying device and technology, relate in particular to the device and the technology of a kind of superheated steam and high frequency combined drying brown coal.
Background technology
The dry technology of brown coal is a lot, mainly contains the direct contact drying of hot flue gas, saturated vapor contact drying, oil drying, hot water drying and superheat steam drying etc.The direct contact drying of hot flue gas adopts high-temperature flue gas directly to contact the moisture that removes in the brown coal with brown coal; It has that technology is simple, easy to operate, treating capacity is big, be easy to advantage such as industrialization; Be comparatively ripe at present a kind of brown coal drying technology, but have shortcomings such as being prone to spontaneous combustion blast, UTILIZATION OF VESIDUAL HEAT IN difficulty.It is drying medium that the saturated vapor contact drying adopts low-pressure saturated steam, removes moisture through tube wall heat transfer indirect brown coal, its have safe, can the continued operation operation etc. advantage, but have also that disposal ability is little, deficiency such as power consumption and water consumption are big.Oil drying is to be drying medium with oils, mixes pulping, generally thermal dehydration under normal pressure to coal and oil.The hot water drying mode is that coal-water mixture is packed in the high-pressure bottle, and airtight this high-pressure bottle of back heating makes the moisture that is in the brown coal in the HTHP hot water discharge with liquid form.Oil drying and hot water dry technology still are in experimental stage at present, and technology is still immature.Superheat steam drying is meant a kind of drying mode that utilizes superheated steam directly to contact with material and remove moisture, and it has, and energy-saving effect is outstanding, drying quality is good, nothing is caught fire and characteristics such as explosion danger, heat and mass efficient height, is fit to carry out the drying of brown coal.
Patent (200910015753.9) discloses a kind of superheated steam brown coal pre-drying device and technology thereof, and the drying process of just internal heating fluidized bed and superheat steam drying grafting is suitable for the dried of brown coal, has advantages such as advanced person, efficient, safety.But the brown coal superheat steam drying exists constant rate drying period and falling rate drying period.At constant rate drying period, the moisture of brown coal drying mainly is free moisture, and rate of drying is very fast, and capacity usage ratio is high.And at falling rate drying period; The moisture of brown coal drying mainly is inherent moisture; The Changing Pattern of rate of drying is relevant with material properties and internal structure, and total moisture that shows as is lower than the boil-off rate of material table towards dry gas from material inside to the speed that shift on the surface, and evaporation is transformed into diffusion inside control by surface vaporization control; Descend rapidly in this stage rate of drying, capacity usage ratio reduces.Therefore, this device and technology thereof are falling rate drying period in the later stage of brown coal drying, can have that rate of drying is little, drying time is long and the deficiency such as big that consumes energy, and need improve this technology.
The present invention will utilize the dielectric drying technology to have the dry advantage of suitable material internal moisture, adopt this technology to substitute the inherent moisture that Superheated Steam Drying Technology is used for dry brown coal, further optimize the drying effect of brown coal, improve capacity usage ratio.
Summary of the invention
The present invention proposes to adopt internal heating fluidized bed dry technology of superheated steam and dielectric drying technical tie-up drying; Promptly adopt the free moisture of the dry brown coal of the internal heating fluidized bed technology of superheated steam; Adopt the inherent moisture of the dry brown coal of dielectric drying technology; Reasonable energy utilization has improved the brown coal drying effect.For realizing above-mentioned purpose, the present invention adopts following technical proposals:
The device of a kind of superheated steam and high frequency combined drying brown coal comprises internal heating fluidized bed drying machine, dielectric dryer and the external heat exchanger of at least one built-in heat exchanger; Internal heating fluidized bed drying machine is provided with feeding device and dust arrester; The built-in heat exchanger of internal heating fluidized bed drying machine is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine is connected with superheated steam, and built-in heat exchanger also is connected with condensate system; The weary gas of internal heating fluidized bed drying machine through the dust arrester dedusting and after pressue device pressurization, dust arrester dedusting a part return fluid bed; Another part emptying after the air heat exchange after external heat exchanger and the pressurization, heated air gets into dielectric dryer through ventilating system.
Said dust arrester is made up of cyclone dust collectors and electric cleaner; Wherein weary gas is after the cyclone dust collectors dedusting, and the dry powder of collection is sent into the finished product district, and weary gas gets into the electric cleaner dedusting after the pressue device pressurization, and one the tunnel returns fluid bed after the dedusting, the emptying after the air heat exchange after external heat exchanger and the pressurization of another road.
The discharging opening of the charging aperture of said internal heating fluidized bed drying machine, discharging opening and cyclone dust collectors all is connected with discharge valve.
Said feeding device comprises feed bin, and feed bin cooperates with screw conveyer, and screw conveyer is connected with the discharge valve I, and the discharge valve I is connected with internal heating fluidized bed drying machine.
Said pressue device is a blower fan.
Said dielectric dryer tranmitting frequency is the electric wave of 6.78MHz or 13.56MHz or 27.12MHz or 40.68MHz; Make dielectric molecule polarization repeatedly under the electric field action that changes in the material; The continuous frictional vibration of molecule between positive and negative two electrodes; Produce heat energy, make the moisture vaporization in the material.
The principle of dielectric drying is: tranmitting frequency is the high-frequency electric wave of 6.78MHz (or 13.56MHz, 27.12MHz, 40.68MHz); The polar molecule that is in the material in the electric field will be arranged again; One end of positively charged is towards negative pole, and an electronegative end is towards positive pole.If change direction of an electric field, then the orientation of polar molecule also changes thereupon.If electric field alternately changes direction rapidly, then polar molecule is also along with rapid swing.Because the warm-up movement of molecule and the interaction between adjacent molecule, polar molecule change the rule swing of doing with direction of an electric field and will be interfered and hinder, and have promptly produced the effect of similar friction, make molecule obtain energy, produce heat energy, the moisture vaporization in the material.This shows, thereby dielectric drying mainly is to make the inner hydrone effect of material and vaporize and reach the purpose of dry materials, thereby this dry technology is very suitable for the drying of brown coal inherent moisture.
Therefore, adopt, the free moisture and the inherent moisture of brown coal are distinguished drying the internal heating fluidized bed drying of superheated steam and dielectric drying drying process linked together, reasonable, effectively utilized the energy.
The technology of a kind of superheated steam and high frequency combined drying brown coal, it is fluidizing agent with the superheated steam, directly contacts with brown coal and takes away part steam, the brown coal that come out from fluid bed are further removed moisture again through the electromagnetic field of high frequency; Its detailed process is:
1) brown coal that will wet are sent into the charging aperture of internal heating fluidized bed drying machine from feed bin by screw conveyer, discharge valve, get in the fluid bed.
2) superheated steam gets into fluid bed by internal heating fluidized bed bottom air compartment, behind the equal wind of air-distribution device, gets into bed.
3) saturated vapor is sent into its built-in heat exchanger as drying source.
4), behind dry intact its inherent moisture, brown coal are sent into dielectric dryer by the discharge valve discharge through the control time of staying of brown coal in bed.
5) the weary gas of internal heating fluidized bed drying machine drying moisture of separating out and part superheated steam is after the cyclone dust collectors dedusting; The brown coal powder of collecting is sent into dielectric dryer through discharge valve; Weary gas gets into the electric cleaner dedusting after the blower fan pressurization; One the tunnel returns fluid bed after the dedusting, emptying after the air heat exchange after pressurizeing through external heat exchanger and by blower fan in another road.
6) got into dielectric dryer by the air of external heater heating through ventilating system.
7) through the control brown coal in the time of staying of dielectric drying chamber, be dried to the moisture of requirement after, brown coal are discharged send into the finished product district.
8) air that feeds dielectric dryer passes through the ventilating system emptying together with dry moisture of separating out.
9) the whole return boilers of condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine utilize again.
The water content of said wet brown coal is 30%-60%.
The invention has the beneficial effects as follows: through Superheated Steam Drying Technology and dielectric drying technology are combined, utilize the characteristics of these two kinds of dry technologies, the respectively free moisture and the inherent moisture of dry brown coal have outstanding advantages such as energy-conservation, safety, environmental protection, water saving.This is environmentally friendly, resource-conserving clean coal technological project is applied to domestic brown coal power plant, colliery and Coal Chemical Industry project; Through upgrading that the brown coal pretreating process is undergone technological transformation; Can obviously reduce fuel consumption and CO2 discharging; Reduce the loss of corollary system, improve the overall efficiency of power plant, Coal Chemical Industry system.
Description of drawings
Fig. 1 is a process chart of the present invention.
Wherein, 1. feed bin, 2. conveying worm, 3. discharge valve I, 4. internal heating fluidized bed drying machine, 5. discharge valve II, 6. cyclone dust collectors, 7. discharge valve III, 8. blower fan I, 9. electric cleaner, 10. dielectric dryer, 11. external heat exchanger, 12. blower fan II.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1, the device of the superheated steam of present embodiment and high frequency combined drying brown coal comprises internal heating fluidized bed drying machine 4, dielectric dryer 10 and the external heat exchanger 11 of a built-in heat exchanger;
Internal heating fluidized bed drying machine 4 is provided with feed bin 1, screw conveyer 2 and discharge valve I3, and feed bin 1 cooperates with screw conveyer 2, and screw conveyer 2 is connected with discharge valve I 3, and discharge valve I 3 is connected with internal heating fluidized bed drying machine 4.
Internal heating fluidized bed drying machine 4 is provided with cyclone dust collectors 6 and electric cleaner 9; Wherein weary gas is after cyclone dust collectors 6 dedustings; The dry powder of collecting is sent into the finished product district; Weary gas gets into electric cleaner 9 dedustings after blower fan I8 pressurization; After the dedusting one the tunnel return internal heating fluidized bed drying machine 4 fluid bed, another road through external heat exchanger 11 with by the air heat exchange after the blower fan II12 pressurization after emptying, heated air gets into dielectric dryer 10 through ventilating system.
The built-in heat exchanger of internal heating fluidized bed drying machine 4 is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine 4 is connected with superheated steam, and built-in heat exchanger also is connected with condensate system.
The discharging opening of the charging aperture of said internal heating fluidized bed drying machine 4, discharging opening and cyclone dust collectors 9 connects discharge valve I3, discharge valve II5 and discharge valve III7 respectively.
The whole return boilers of condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine 4 utilize again.
Technology of the present invention is:
1) moisture 30%-60% wet brown coal is sent into the charging aperture of internal heating fluidized bed drying machine 4 from feed bin 1 by screw conveyer 2, discharge valve I 3, get in the fluid bed.
2) superheated steam gets into fluid bed by internal heating fluidized bed bottom air compartment, behind the equal wind of air-distribution device, gets into bed.
3) saturated vapor is sent into its built-in heat exchanger as drying source.
4), behind dry intact its free moisture, brown coal are sent into dielectric dryer 10 by 5 discharges of discharge valve II through the control time of staying of brown coal in bed.
5) the weary gas of internal heating fluidized bed drying machine 4 dryings moisture of separating out and part superheated steam is after cyclone dust collectors 6 dedustings; The brown coal powder of collecting is sent into dielectric dryer 10 through discharge valve III 7; Weary gas gets into electric cleaner 9 dedustings after 8 pressurizations of blower fan I; One the tunnel returns fluid bed after the dedusting, emptying after the air heat exchange after pressurizeing through external heat exchanger 11 and by blower fan II 12 in another road.
6) got into dielectric dryer 10 by the air of external heater 11 heating through ventilating system.
7) through the control brown coal in the time of staying of dielectric drying chamber, be dried to the moisture of requirement after, brown coal are discharged send into the finished product district.
8) air that feeds dielectric dryer 10 passes through the ventilating system emptying together with dry moisture of separating out.
9) the whole return boilers of condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine 4 utilize again.
Though the above-mentioned accompanying drawing specific embodiments of the invention that combines is described; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. the device of superheated steam and high frequency combined drying brown coal is characterized in that, comprises internal heating fluidized bed drying machine, dielectric dryer and the external heat exchanger of at least one built-in heat exchanger; Internal heating fluidized bed drying machine is provided with feeding device and dust arrester; The built-in heat exchanger of internal heating fluidized bed drying machine is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine is connected with superheated steam, and built-in heat exchanger also is connected with condensate system; The weary gas of internal heating fluidized bed drying machine through the dust arrester dedusting and behind pressue device pressurization, dust arrester final dusting a part return fluid bed; Another part emptying after the air heat exchange after external heat exchanger and the pressurization, heated air gets into dielectric dryer through ventilating system.
2. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal is characterized in that said dust arrester is made up of cyclone dust collectors and electric cleaner; Wherein weary gas is after the cyclone dust collectors dedusting, and the dry powder of collection is sent into the finished product district, and weary gas gets into the electric cleaner dedusting after the pressue device pressurization, and one the tunnel returns fluid bed after the dedusting, the emptying after the air heat exchange after external heat exchanger and the pressurization of another road.
3. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal is characterized in that the discharging opening of the charging aperture of said internal heating fluidized bed drying machine, discharging opening and cyclone dust collectors all is connected with discharge valve.
4. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal; It is characterized in that said feeding device comprises feed bin, feed bin cooperates with screw conveyer; Screw conveyer is connected with the discharge valve I, and the discharge valve I is connected with internal heating fluidized bed drying machine.
5. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal is characterized in that, said pressue device is a blower fan.
6. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal; It is characterized in that; Said dielectric dryer tranmitting frequency is the electric wave of 6.78MHz or 13.56MHz or 27.12MHz or 40.68MHz, makes dielectric molecule polarization repeatedly under the electric field action that changes in the material, the continuous frictional vibration of molecule between positive and negative two electrodes; Produce heat energy, the moisture vaporization in the material.
7. the technology of superheated steam and high frequency combined drying brown coal may further comprise the steps:
1) brown coal that will wet are sent into the charging aperture of internal heating fluidized bed drying machine from feed bin by screw conveyer, discharge valve, get in the fluid bed;
2) superheated steam gets into fluid bed by internal heating fluidized bed bottom air compartment, behind the equal wind of air-distribution device, gets into bed;
3) saturated vapor is sent into its built-in heat exchanger as drying source;
4), behind dry intact its inherent moisture, brown coal are sent into dielectric dryer by the discharge valve discharge through the control time of staying of brown coal in bed;
5) the weary gas of internal heating fluidized bed drying machine drying moisture of separating out and part superheated steam is after the cyclone dust collectors dedusting; The brown coal powder of collecting is sent into dielectric dryer through discharge valve; Weary gas gets into the electric cleaner dedusting after the blower fan pressurization; One the tunnel returns fluid bed after the dedusting, emptying after the air heat exchange after pressurizeing through external heat exchanger and by blower fan in another road;
6) got into dielectric dryer by the air of external heater heating through ventilating system;
7) through the control brown coal in the time of staying of dielectric drying chamber, be dried to the moisture of requirement after, brown coal are discharged send into the finished product district;
8) air that feeds dielectric dryer passes through the ventilating system emptying together with dry moisture of separating out;
9) the whole return boilers of condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine utilize again.
8. the technology of superheated steam as claimed in claim 7 and high frequency combined drying brown coal is characterized in that, the water content of wet brown coal is 30%-60% in the said step 1).
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| CN201210158454.2A CN102650494B (en) | 2012-05-21 | 2012-05-21 | Device and technology for drying lignite by jointly using superheated steam and high frequency |
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| CN201210158454.2A CN102650494B (en) | 2012-05-21 | 2012-05-21 | Device and technology for drying lignite by jointly using superheated steam and high frequency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409198A (en) * | 2013-07-23 | 2013-11-27 | 山东天力干燥股份有限公司 | Drying, desulphurization and dehydration system and process for low-rank coal or coal slime |
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| CN201413003Y (en) * | 2009-06-04 | 2010-02-24 | 山东天力干燥设备有限公司 | Superheated steam lignite predrying system |
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
| US20110265342A1 (en) * | 2009-06-04 | 2011-11-03 | Shandong Tianli Drying Equipment Co., Ltd. | Superheated vapor pre-drying systems for lignite and methods for drying lignite |
| CN202582098U (en) * | 2012-05-21 | 2012-12-05 | 山东天力干燥股份有限公司 | Device capable of drying lignite by combining superheated steam and high frequency |
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- 2012-05-21 CN CN201210158454.2A patent/CN102650494B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| CN201413003Y (en) * | 2009-06-04 | 2010-02-24 | 山东天力干燥设备有限公司 | Superheated steam lignite predrying system |
| US20110265342A1 (en) * | 2009-06-04 | 2011-11-03 | Shandong Tianli Drying Equipment Co., Ltd. | Superheated vapor pre-drying systems for lignite and methods for drying lignite |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
| CN202582098U (en) * | 2012-05-21 | 2012-12-05 | 山东天力干燥股份有限公司 | Device capable of drying lignite by combining superheated steam and high frequency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409198A (en) * | 2013-07-23 | 2013-11-27 | 山东天力干燥股份有限公司 | Drying, desulphurization and dehydration system and process for low-rank coal or coal slime |
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